Condensed Consolidated Balance Sheets (Parenthetical) (USD $) In Thousands, except Share data, unless otherwise specified	Mar. 31, 2013	Dec. 31, 2012
Accounts receivable, allowances	$ 12,900	$ 12,400
Preferred stock, par value	$ 1	$ 1
Preferred stock, authorized	5,000,000	5,000,000
Preferred stock, issued
Common stock, par value	$ 0.25	$ 0.25
Common stock, authorized	600,000,000	600,000,000
Common stock, issued	80,481,858	81,697,409
Common stock, outstanding	80,481,858	81,697,409